iAPI Docs: Fix typo in "Understanding global state, local context, and derived state" file name

[DAreRodz]

What?

Fix a typo in the "Understanding global state, local context, and derived state" guide filename (undestanding → understanding) and update all references across the docs.

Why?

The filename for the "Understanding global state, local context, and derived state" guide contained a
typo (undestanding), which caused broken links across multiple documentation pages.

How?

• Renamed undestanding-global-state-local-context-and-derived-state.md to
  understanding-global-state-local-context-and-derived-state.md.
• Updated all internal references to the file in:
  • docs/reference-guides/interactivity-api/core-concepts/README.md
  • docs/reference-guides/interactivity-api/core-concepts/the-reactive-and-declarative-mindset.md
  • docs/reference-guides/interactivity-api/core-concepts/using-typescript.md
  • docs/reference-guides/interactivity-api/core-concepts/server-side-rendering.md
  • docs/manifest.json (slug and markdown_source)
  • docs/toc.json

[github-actions]

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Co-authored-by: DAreRodz <darerodz@git.wordpress.org>
Co-authored-by: shail-mehta <shailu25@git.wordpress.org>
Co-authored-by: luisherranz <luisherranz@git.wordpress.org>

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[luisherranz]

Superseded by this pull request, with a review of the changes in 1b1b1ee:

• iAPI Docs: Introduce reactive vs non-reactive distinction early in the state/context guide #75357 (comment)